JPS5850753Y2 - Simple seal bag with closure piece - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the opening of a bag, which is sealed by bonding the opening of the bag with an adhesive.

Conventionally, this type of bag has a large back cylindrical body with a step on the front and rear walls of the cut edge of the opening, and adhesive is applied to both ends, and the back wall is overlapped with the front wall to seal the opening. The so-called envelope pasting type is widely used, but when applying adhesive to the cut edge of the opening of a heavy packaging bag, it is difficult to apply the adhesive to an even thickness on the applied surface. In addition to requiring a lot of work, if granular materials are stored, the stored items will move within the bag during transportation, storage, and other handling, and impact will be applied to the opening of the bag, resulting in leakage of the stored items due to the uneven coating surface. As well as causing
It also causes bags to break.

This invention was devised to eliminate the above defects.
To provide a simple mouth-sealing bag with a closure piece that is provided at the cut end edge of the mouth part to achieve double sealing, increase reinforcement of the mouth part, and completely prevent leakage of stored contents.

An example of implementing the present invention will now be described in detail with reference to the drawings.

Figure 1 shows a hot-melt adhesive layer 3 provided with a certain width at the upper edge of the back side of the base paper of a cylindrical body 1 consisting of one layer, at the inside position of the rear wall 2 when the cylindrical body is formed. It is a development diagram of the time.

FIG. 2 is a developed view when a hot melt adhesive layer 5 is provided with a certain width on the outside of the front wall 4 when the base paper in FIG. 1 is formed into a cylindrical body at the upper edge of the surface. .

Next, the cylindrical body 1 is formed by overlapping both side edges of the base paper and pasting the cylinder.

Furthermore, cut lines 6, 6 are cut with an extra length on both side edges of the front wall 4 where the hot melt adhesive layer 5 is applied, and a closing piece is bent inwardly between the cut lines. 7 to form the main case.

Incidentally, the bottom opening may be provided with a single bottom by a conventional method such as sewing with a sewing machine or gluing.

Further, in the embodiments, an example of a single layer of base paper has been described, but it goes without saying that it may be made of multiple layers, and that any bag material may be used.

Therefore, after storing the contents in the bag of the present invention, in order to seal the opening, the inwardly bent closing piece 7 formed on the upper edge of the front wall is moved inward from the terminal 8 of the bag. the adhesive layer surface is brought into close contact with the inner surface of the bag rear wall, and then the adhesive layer surface is bent forward from the terminal 9 of the hot melt adhesive layer 3 on the rear wall 2 to bring it into close contact with the outer surface of the bag wall; The two are bonded together by means such as thermal bonding.

Therefore, the opening of the proposed bag is different from the conventionally widely used one where a tongue piece provided on the rear wall is attached to the front wall to seal the opening.
The inwardly bent closing piece 7 and the inner surface of the rear wall 2, as well as the hot-melt adhesive layer 3 of the rear wall 2 and the outer surface of the front wall 4, are double thermally bonded and sealed.

In addition, the incision lines 6.6 constituting the inwardly bent closure piece 7 are provided at positions that leave a slight extra length on both side edges of the cylindrical body, so that it is easy to use when transporting or storing the bag. Even when handling cargo, it will not be torn from its corners, so there is no risk of the contents leaking out.

Therefore, compared to the conventionally widely used bag in which a tongue piece provided on the rear wall is thermally bonded to the front wall, the bag according to the present invention completely prevents the contents from leaking due to the inwardly bent closure piece 7 inside the bag. Furthermore, since the hot-melt adhesive layer provided on the rear wall is thermally bonded to the outer surface of the front wall, the opening is double sealed and the reinforcing effect is significantly increased, making it difficult to maintain the same strength in practice. We were able to supply bags without.

[Brief explanation of drawings]

Figure 1 is a developed view of the case where a hot melt adhesive layer is provided on the upper edge of the back surface of the base paper of the cylindrical body, and Figure 2 is a developed view of the hot melt adhesive layer provided on the upper edge of the front surface of the base paper in Figure 1. Fig. 3 is a plan view of a cylindrical body made from the base paper shown in Fig. 1, and Fig. 4 is a plan view of the inwardly folded closure piece when it is folded inward. Figure 5 is a longitudinal sectional view taken along line A-A' in Figure 4;
Figure 6 is an enlarged explanatory view of the inwardly folded closing piece before being folded inward and the hot melt adhesive layer 3 is folded onto the front wall, and Figure 7 is an enlarged view of storing items in the bag shown in Figure 5. An enlarged explanatory view of the mouth after the process is completed. In the figure, each reference symbol is 1: cylindrical body, 2: rear wall, 3.5: hot melt adhesive layer, 4: front wall, 6, 6: cut line, 7: numerals 8 and 9 indicate an inwardly bent closing piece, and terminals 8 and 9, respectively.

Claims (1)

[Scope of utility model registration request] At the cut edge of the opening of the bag, over the entire width of the outermost layer of one side wall of the opposing wall and the innermost layer of the other side wall, with a constant width,
Each hot melt adhesive layer is provided, cut lines are cut near both edges on the outermost layer side of one side wall, and a closure piece is folded inwardly between the two cut lines. Seal bag.